Alert archive / Georgia / Tornado Watches in 2020
Tornado Watch 498
The Storm Prediction Center issued this tornado watch at Oct 10, 2020, 12:47 PM CDT for 21 counties in Alabama; 39 counties in Georgia. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Oct 10, 2020, 12:47 PM CDT (17:47 UTC)
- Expired
- Oct 10, 2020, 8:00 PM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Strongest gust expected
- 50 kt
All 60 counties
Barbour County, AL, Bullock County, AL, Calhoun County, AL, Chambers County, AL, Clay County, AL, Cleburne County, AL, Coffee County, AL, Coosa County, AL, Dale County, AL, Elmore County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Lee County, AL, Macon County, AL, Montgomery County, AL, Pike County, AL, Randolph County, AL, Russell County, AL, Talladega County, AL, Tallapoosa County, AL, Bibb County, GA, Butts County, GA, Carroll County, GA, Chattahoochee County, GA, Clayton County, GA, Cobb County, GA, Coweta County, GA, Crawford County, GA, DeKalb County, GA, Douglas County, GA, Fayette County, GA, Fulton County, GA, Gwinnett County, GA, Haralson County, GA, Harris County, GA, Heard County, GA, Henry County, GA, Lamar County, GA, Macon County, GA, Marion County, GA, Meriwether County, GA, Monroe County, GA, Muscogee County, GA, Newton County, GA, Paulding County, GA, Peach County, GA, Pike County, GA, Polk County, GA, Rockdale County, GA, Schley County, GA, Spalding County, GA, Stewart County, GA, Sumter County, GA, Talbot County, GA, Taylor County, GA, Troup County, GA, Upson County, GA, Walton County, GA, Webster County, GA
The radar
The Maxwell AFB radar (KMXX), 69 km from the middle of the area, began a volume at 17:49 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 50%
- One or more EF2 to EF5 tornadoes
- 10%
- Ten or more severe wind reports
- 20%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 5%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 30%
Warnings issued inside it
21 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 10, 3:27 PM CDT | Tornado Warning | FFC | Chattahoochee, Marion, Muscogee, Stewart | 27 min |
| Oct 10, 3:39 PM CDT | Tornado Warning | FFC | Harris, Muscogee | 51 min |
| Oct 10, 4:13 PM CDT | Tornado Warning | FFC | Gwinnett, Walton | 32 min |
| Oct 10, 4:27 PM CDT | Tornado Warning | FFC | Harris, Meriwether, Pike, Talbot, Upson | 48 min |
| Oct 10, 4:38 PM CDT | Tornado Warning | FFC | Carroll, Heard | 37 min |
| Oct 10, 5:10 PM CDT | Tornado Warning | FFC | Carroll, Coweta, Fulton | 35 min |
| Oct 10, 5:11 PM CDT | Tornado Warning | FFC | Talbot, Taylor, Upson | 34 min |
| Oct 10, 5:21 PM CDT | Tornado Warning | FFC | Pike, Spalding | 24 min |
| Oct 10, 5:33 PM CDT | Tornado Warning | FFC | Carroll, Coweta, Douglas, Fulton | 27 min |
| Oct 10, 5:44 PM CDT | Severe Thunderstorm Warning | FFC | Floyd, Haralson, Polk | 31 min |
| Oct 10, 5:45 PM CDT | Tornado Warning | FFC | Lamar, Monroe, Upson | 45 min |
| Oct 10, 5:49 PM CDT | Tornado Warning | FFC | Clayton, Fayette, Henry, Spalding | 26 min |
| Oct 10, 5:55 PM CDT | Tornado Warning | FFC | Floyd, Polk | 35 min |
| Oct 10, 6:05 PM CDT | Tornado Warning | FFC | Henry, Spalding | 25 min |
| Oct 10, 6:17 PM CDT | Tornado Warning | FFC | Clayton, Henry | 28 min |
| Oct 10, 6:24 PM CDT | Tornado Warning | FFC | Butts, Henry, Lamar, Monroe | 36 min |
| Oct 10, 6:39 PM CDT | Tornado Warning | FFC | Clayton, Henry | 22 min |
| Oct 10, 6:47 PM CDT | Tornado Warning | FFC | Clayton, DeKalb, Henry | 28 min |
| Oct 10, 7:06 PM CDT | Tornado Warning | FFC | DeKalb | 24 min |
| Oct 10, 7:33 PM CDT | Tornado Warning | FFC | DeKalb, Gwinnett | 27 min |
| Oct 10, 7:55 PM CDT | Flash Flood Warning | FFC | Clayton, Cobb, DeKalb, Fulton | 6 hr |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 5.8 hours before the alert went out and 84 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 261 J/kg
- Mixed-layer CIN
- -16 J/kg
- Mixed-layer LCL
- 503 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 166 m²/s²
- 0-3 km storm-relative helicity
- 217 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
736 WWUS20 KWNS 101743 SEL8 SPC WW 101743 ALZ000-GAZ000-110100- URGENT - IMMEDIATE BROADCAST REQUESTED Tornado Watch Number 498 NWS Storm Prediction Center Norman OK 1245 PM CDT Sat Oct 10 2020 The NWS Storm Prediction Center has issued a * Tornado Watch for portions of Much of eastern Alabama West central Georgia * Effective this Saturday afternoon and evening from 1245 PM until 800 PM CDT. * Primary threats include... A few tornadoes possible Isolated damaging wind gusts to 60 mph possible SUMMARY...Scattered mini supercells are expected in a broken band from eastern Alabama into west central Georgia through this evening, to the east of the weakening remnants of tropical cyclone Delta. The storm environment will be sufficient for a few tornadoes, and perhaps isolated strong/damaging gusts. The tornado watch area is approximately along and 45 statute miles east and west of a line from 45 miles northwest of Atlanta GA to 30 miles southwest of Dothan AL. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU8). PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER...A Tornado Watch means conditions are favorable for tornadoes and severe thunderstorms in and close to the watch area. Persons in these areas should be on the lookout for threatening weather conditions and listen for later statements and possible warnings. && OTHER WATCH INFORMATION...CONTINUE...WW 497... AVIATION...Tornadoes and a few severe thunderstorms with hail surface and aloft to 0 inches. Extreme turbulence and surface wind gusts to 50 knots. A few cumulonimbi with maximum tops to 500. Mean storm motion vector 20035. ...Thompson
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 10, 2:23 AM CDT | Mesoscale Discussion | SPC | Baldwin, Choctaw, Clarke, Conecuh, Escambia, Marengo and 5 more | 2 hr |
| Oct 10, 4:00 AM CDT | Tornado Watch | SPC | Baldwin, Butler, Choctaw, Clarke, Conecuh, Covington and 6 more | 10 hr |
| Oct 10, 7:09 AM CDT | Mesoscale Discussion | SPC | Baldwin, Conecuh, Escambia, Monroe | 2 hr |
| Oct 10, 11:13 AM CDT | Mesoscale Discussion | SPC | Barbour, Bullock, Chambers, Clay, Cleburne, Coffee and 14 more | 2 hr |
| Oct 10, 3:54 PM CDT | Mesoscale Discussion | SPC | Barbour, Bullock, Calhoun, Chambers, Clay, Cleburne and 12 more | 96 min |
| Oct 10, 6:17 PM CDT | Mesoscale Discussion | SPC | Baldwin, Banks, Barrow, Bartow, Bibb, Bleckley and 51 more | 118 min |
Nearby
Tornado Watches in Georgia, 2020Tornado Watches in Alabama, 2020Every tornado watch in 2020
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.